【摘要】 武昌野芷湖湾菹草(PotamogetoncrispusL.)生物量较高位置的沉积物显示明显较高的磷吸附指数,以及据Langmuir方程:C/X=C/Xm+K×1/Xm导出的最大吸附量与吸附强度,这一结果在不同时期与不同采样深度均有体现,故提高沉积物磷的吸附能力应为菹草维持水体较低营养水平的重要机制。铁结合态磷是沉积物磷的主要存在形式,吸附能力的提高可由有机质及其与铁的相互作用部分地得到解释。不同时期菹草生物量较高的沉积物表现明显较低的碱性磷酸酶活性与最大反应速度,降低沉积物有机磷的酶促分解速率应为菹草维持水体低营养水平的另一机制。更多还原

【Abstract】 In a sinus of Lake Yezhi localized in the southern suburb of Wuhan City,the sediments with high biomass of Potamogeton crispus showed significantly higher P sorption index,maximum sorption capacity and sorption bonding energy,calculated by the Langmuir equation :C/X=C/X_m+K×1/X_m,a common result derived from the samples in different times and at different depths.Therefore,increasing the P sorption ability is an important mechanism for P.crispus to maintain the low nutrient level in water body.Since iron bonding P dominated in P pool in sediments,the improvement of P sorption ability could be partially explained by the role of organic matter and its interaction with iron.The sediments with high biomass of P.crispus collected in different times exhibited significantly lower activity and maximum reaction rate of alkaline phosphatase,which meant that the decomposition rate of organic matter mediated by alkaline phosphatase decreased,providing an additional mechanism for P.crispus to maintain the low nutrient level in water level.更多还原